Method:
We used 40 single-canal premolars that had a curvature between 10 and 20 degrees according to Schneider. The samples were divided into 4 groups. Each group was assigned 10 randomly selected roots. Were instrumented with the balanced force technique (Flex-R) to the file # 50, was irrigated with NaOCl using different chelators: Smear Clear, Tubulicid plus and REDTA, observing the three thirds: cervical, middle and apical. Were observed in the scanning electron microscope to obtain the degree of cleanliness and analyze better eliminating residual layer in the dentinal tubules.
Result: The results in the removal of the residual layer, around the conduit showed significant differences. (P<.05) The presentation more residual layer was removed Smear Clear much as Tubulicid Plus.The results regarding severe residual layer throughout the root canal in the cervical third medium and apical NaOCl group was 5.25% greater control.
Conclusion: In this study, Smear Clear showed characteristics more favorable to remove the residual layer Tubulicid plus root canals. And REDTA was the least removed the residual layer.